"Multiple studies have shown that faster-responding resources such as flywheels can deliver improved performance and value by reducing the overall need for regulation procurement and thus should be paid more for the superior service they provide," Capp said in a statement.

Vehicle makers also "correspondingly can reduce mass in other major components, such as flywheels and clutches, which will further reduce weight, boost fuel economy and improve performance," the report said.

Vehicle makers also "correspondingly can reduce mass in other major components, such as flywheels and clutches, which will further reduce weight, boost fuel economy, and improve performance," the study suggests.

The Indo-Row machines—which have water-filled flywheels intended to replicate an on-water experience—are mounted with monitors that measure each rower's miles per hour and calories burned, which helps motivate Mr. Rubens.